US4359068A - Electronic weft stop motion on a gripper shuttle weaving machine - Google Patents

Electronic weft stop motion on a gripper shuttle weaving machine Download PDF

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Publication number
US4359068A
US4359068A US06/144,231 US14423180A US4359068A US 4359068 A US4359068 A US 4359068A US 14423180 A US14423180 A US 14423180A US 4359068 A US4359068 A US 4359068A
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United States
Prior art keywords
thread
weft
stop motion
shuttle
tactile
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US06/144,231
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English (en)
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Erich Loepfe
Erich Weidmann
Walter Schumperli
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Loepfe AG Gebrueder
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Loepfe AG Gebrueder
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    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D51/00—Driving, starting, or stopping arrangements; Automatic stop motions
    • D03D51/18—Automatic stop motions
    • D03D51/34—Weft stop motions

Definitions

  • the present invention relates to a novel electronic weft stop motion on a gripper shuttle weaving machine provided with a shuttle picking device, shuttle catching means including shuttle braking and resetting means, and thread tensioning means in advance of the shuttle picking device for laterally deflecting the weft yarn during the action of the shuttle resetting means.
  • a gripper shuttle weaving machine and weft stop motions fitted thereto are described in German patent publication No. 1,535,615.
  • Weaving machines of this type are generally known and in widespread use.
  • Essential for the function of the weft stop motion or weft thread monitor in this case is the cooperation of the elements effecting the weft insertion, in particular the gripper shuttle or projectile, a thread brake located on the picking side and a subsequently arranged thread tensioner.
  • This weft thread monitor responds to the so-called pull-after motion of the weft thread which occurs in the last phase of the lateral deflection thereof: when the weft thread inserted in the weaving shed has been tensioned, a small thread end is pulled through the thread brake in a direction from the supply spool of the weaving machine.
  • a roller is provided as thread feeler and arranged in the region of lateral deflection. Rotation of the roller is sensed and indicated by an optoelectrical sensor. The roller comes into contact with the weft thread only upon lateral deflection thereof without at first being set into rotation. After that the roller is rotated when the pull-after movement begins, and the sensor responds and produces a signal indicative of an intact weft thread.
  • a particular trigger device controlled by the weaving machine delimits the response of the weft thread monitor to a time interval defined by the pull-after motion. Absence of the sensor signal within this time interval causes the weaving machine to stop.
  • the late monitoring when the weft thread has already been inserted is advantageous since disturbances, such as thread breaks, which do not seldomly occur in the last phase of the weft insertion are detected.
  • a very small time interval is available for the timely or correct stopping of the weaving machine, and the inertia of the roller feeler is detrimental in this respect.
  • the pull-after motion may fail to appear even with an intact or correctly inserted weft thread; in this event the weft thread monitor causes an unwanted or faulty stop of the weaving machine.
  • inventive electronic weft stop motion which comprises tactile or contact-type thread sensing means located in the region of the lateral deflection of the weft yarn such as to be frictionally contacted by the tensioned weft yarn only upon such lateral deflection for furnishing an electrical thread sensing signal indicative of correct weft insertion.
  • FIG. 1 illustrates the operation of weft insertion controlling components of a projectile weaving machine during a working cycle thereof
  • FIG. 2 shows some distinct angular positions of the thread tensioner during the tensioning operation
  • FIGS. 3 and 4 show the arrangement of a tactile thread sensor and thread tensioner in the positions according to FIG. 1, including the associated paths of the weft thread, in front and plan view, respectively;
  • FIG. 5 shows a tactile piezoelectrical thread sensor in cross-sectional view
  • FIG. 6 illustrates a tactile triboelectrical thread sensor in cross-sectional view
  • FIG. 7 is a block circuit diagram illustrating the essential electronic circuits of the inventive weft stop motion.
  • FIG. 8 is a block circuit diagram of a conventional electronic weft insertion monitor combined with an inventive weft stop motion comprising a plurality of thread sensors.
  • tensioning phase monitor in view of the peculiar operation thereof and in distinction from the conventional weft thread monitors.
  • FIG. 1 demonstrates some distinct phases in the working cycle of the weaving machine.
  • the various positions of the thread tensioner 3 and the paths of the weft thread F between the thread guide eyes or eyelets 9 and 10 are of importance to the function of the thread sensing devices described in the following.
  • FIG. 1 there are further shown a stationary supply spool V, thread brake 4, thread feeder 2, picking lever 11 of the picking mechanism, projectile or gripper shuttle 1, two selvedge thread clips 5, scissors or cutter means 6, two selvedge pins 7, shuttle brake 8 of the catching unit, weaving shed W and cloth or fabric G.
  • FIG. 1 shows at (a) through (g) the following phases or positions of the movable components of the weaving machine:
  • the projectile 1 conveys the thread through the weaving shed W, and the thread tensioner 3 and the controllable thread brake 4 function such that the thread F which is being inserted is loaded or stressed as little as possible. During insertion of the weft thread, the thread tensioner 3 occupies the low position thereof.
  • FIG. 1 there will be explained in which phase of the working cycle of the weaving machine or loom the weft thread is monitored at the region of the thread tensioner 3.
  • the weft thread F is not sensed or monitored in the upper or idle position of the thread tensioner 3 as shown in FIG. 1(a) and 1(b).
  • the projectile 1 is picked and the weft threads F inserted into the weaving shed W. No monitoring takes place also in this phase.
  • the projectile 1 occupies its braked position and in FIG. 1(d) its reset position within the shuttle brake 8. It is obvious that the thread tensioner 3 returns--between the positions according to FIGS.
  • the thread tensioner 3 comprises a lever mounted on a pivot axis 20 and provided with a ring-shaped thread guide 21 at its free end which moves along a cyclic guide path. It may be noted that such a tensioner arrangement is not compulsory; there might alternatively be provided a thread tensioner guiding the thread guide along a linear or other curved path.
  • FIG. 2 illustrates the course of the upward movement of the thread tensioner 3 while the thread guide 21 describes an arc of a circle between a lower position AS and an upper or idle position ES.
  • the weft thread is sensed in a vertical sensing range AB between the positions AS and ES.
  • Sensing range AB is not absolutely fixed, however should be optimally set dependent upon the construction and operational conditions of the weaving machine and while observing the following. It is assumed that a tactile sensing device is to be used, for instance, a piezoelectrical, triboelectrical, magnetoelectrical or electrodynamical sensor may be provided as is known in this technology. Such devices respond to frictional contact with a thread under a certain stress or tension.
  • the sensing range AB may be found by correctly positioning the sensing device 22.
  • the arrangement thereof, as shown in these Figures, on the left side of the thread tensioner 3 and above the thread guide eye 9 is particularly advantageous; firstly, there exists at this point a relatively great stress in the thread being tensioned, and secondly, the sensing device 22 may easily be mounted nearby the thread guide eye 9, for instance at its holder or the like.
  • the section or portion F of the weft thread extending between the thread guide eyes 9,10 is straightened and is not in contact with the sensing device 22.
  • the latter is shaped as a substantially flat box and is provided at its lower right edge with a linear friction element 23 destined for guiding and contacting the thread.
  • the slightly deflected thread section F1 has just come into contact with the friction element 23, such that the sensing process begins and continues during further movement upward into position B.
  • the thread section F2 has been illustrated in FIG. 3 as having been moved upwards and in FIG. 4 as having been moved in backward direction along linear friction element 23.
  • thread tensioner 3 Upon further upward movement of thread tensioner 3, the thread releases from the friction element 23 and finally occupies a position F3 with the thread tensioner 3 in the upper or idle position.
  • the vertical sensing range AB between points A and B, in FIGS. 3 and 4 is marked by an upright arrow.
  • the entire horizontal range FB of the thread tensioner 3 between the thread guide eyes 9 and 10 is principally available for mounting a thread sensor in a similar manner as shown for thread sensing device 22 mounted near thread guide eye 9.
  • the novel tensioning phase monitor has the advantage that the weft thread is in frictional contact with the sensing device 22 only during the short tensioning process.
  • false or spurious signals which may be caused with conventional weft insertion monitors mounted on multicolour projectile machines by resting threads are avoided.
  • Such false signals are of importance when all the sensing devices (such as sensors 22b-22e shown in FIG. 8) are connected to a common signal circuit (such as circuit 40-2). In the event of breakage of the inserted weft thread, such false signals may simulate an orderly weft insertion.
  • a piezoelectrical sensing device or head 22-1 comprises a linear friction element 23-1 which corresponds to the friction element 23, FIGS. 3 and 4, a casing 24-1 shaped as a substantially rectangular box, a vibratable lamella or thin plate 25-1 made from metal, such as spring steel, a fixedly thereto attached flat rectangular piezoelectrical element 25-2, a heavy block 26 at which lamella 25-1 is rigidly mounted, a soft bearing material 27 such as rubber sponge, an elastic sealing material 28, an insert plug 29, and an ouput line connected to piezoelectrical element 25-2 and passing through insert plug 29.
  • a soft bearing material 27 such as rubber sponge
  • an elastic sealing material 28 an insert plug 29, and an ouput line connected to piezoelectrical element 25-2 and passing through insert plug 29.
  • Piezoelectrical and other tactile sensing heads are known, and such known devices may be constructively adapted for use in the inventive tensioning phase monitor.
  • the outer shape of the casing and friction element are designed such that the weft thread when tensioned smoothly comes into contact with the friction element.
  • this objective is realized by the downwardly tapered casings 24-1 and 24-2 and the friction elements 23-1 and 23-2 being linear or straight and having a half-rounded cross-section, and distinctly extending from the casing 24-1 or 24-2, respectively.
  • the triboelectrical sensing head 22-2 comprises, in addition to the aforementioned components, an insert 29 and an output line 30, an electrode lamella or thin plate 31 fixedly connected with the friction element 23-2, a print plate 33 formed of insulating material mounted in casing 24-2 by means of a support 32, and a pre-amplifier 34, e.g. a field-effect transistor mounted on print plate or printed circuit board 33. Electrode lamella 31 is fixed or cemented to print plate 33, and connected with the input of pre-amplifier 34 through a connecting wire 34.
  • FIG. 7 illustrates, by way of example, the arrangement of a tensioning phase monitor comprising a single sensing device 22, and thereto serially connected a signal circuit 40 and switching stage 41.
  • Signal circuit 40 comprises a pre-amplifier 34 and lowpass filter 36 serially connected to sensing device 22, a clock generator 37, e.g. monoflop, controlled by the weaving machine, an AND-gate 38 having a first negated input and a second input, and an indicator, e.g. LED 39, connected to AND-gate 38.
  • the AND-gate 38 produces a signal indicative of yarn breakage only when there appears no sensing signal during the existence of a clock or timing pulse produced by clock generator 37. In this event, LED 39 is energized and the weaving machine is stopped by switching stage 41.
  • Switching stage 41 comprises a driver stage 42, a normally blocked controllable rectifier or SCR 43, a storage condenser or capacitor 45 in parallel with SCR 43, and a stop relay 44 connected in series with SCR 43.
  • the storage condenser or capacitor 45 normally is electrically charged; upon appearance of a thread rupture or breakage signal the controllable rectifier 43 is unlocked or rendered conductive and storage condenser 45 discharged through stop relay 44 which places the weaving machine out of operation.
  • FIG. 7 The block schematic diagram of FIG. 7 in generalized form also pertains to a weft stop motion which monitors the weft insertion rather than the tensioning phase.
  • the sensing device 22 is located at another place on the weaving machine, e.g. in the straight thread path as shown in FIG. 1(a) downstream of guide eye 10 and immediately in advance of thread feeder 2.
  • clock generator 37 is controlled such as to furnish a clock or timing pulse only within the duration of the weft insertion ending with the position of projectile 1 illustrated in FIG. 1(c).
  • the signal circuit 40 and, in particular, the switching stage 41 may be arranged as shown in FIG. 7.
  • a weft thread monitor of this type is described in copending U.S. application Ser. No. 06/111,771, filed Jan. 14, 1980, to which reference may be had and the disclosure of which is incorporated herein by reference.
  • a projectile or gripper shuttle weaving machine provided with a weft insertion monitor of the aforementioned type may, in addition, easily be fitted with an inventive tensioning phase monitor as now will be explained with reference to FIG. 8.
  • FIG. 8 illustrates a combined weft insertion and tensioning phase monitor to be used on a four-colour projectile weaving machine in block schematic representation.
  • the weft insertion monitor comprises a sensing device 22a connected to the input a of a signal circuit 40-1, and a switching stage 41.
  • a single sensing device 22a is necessary, which is located in a straight thread path following four tensioning devices (not shown) of the weaving machine.
  • the additional tensioning phase monitor requires four sensing devices 22b through 22e, a plural signal circuit 40-2 having four inputs b,c,d,e, and an OR-gate arranged between the outputs O,P of signal circuits 40-1 and 40-2, respectively, and the input of switching stage 41, for decoupling said signal circuits. It is obvious that switching stage 41 is common to the components 22a and 40-1 of the weft insertion monitor as well as the components 22b-22e, 42-2 of the tensioning phase monitor.
  • the tensioning phase monitor as described in the foregoing disclosure has, relative to the initially described known weft stop motion monitoring the pull-after motion, the advantage of a safe and practically inertialess indication of weft breakages and, in particular, insertion faults occurring at the end of the projectile flight.
  • the novel tensioning phase monitor is superior in detecting even such insertion faults occurring at the end of the projectile flight.
  • the tensioning phase monitor in addition affords the above mentioned benefit that no false signals caused by resting or idle threads can occur. Such false or spurious signals may be easily produced when thin and thick threads are alternately inserted and impede the machine to be stopped upon breakage of the inserted weft thread. In this event, faulty fabric is produced. Such shortcoming is avoided when using the novel tensioning phase monitor.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
US06/144,231 1979-05-04 1980-04-28 Electronic weft stop motion on a gripper shuttle weaving machine Expired - Lifetime US4359068A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH4188/79 1979-05-04
CH418879A CH639152A5 (de) 1979-05-04 1979-05-04 Elektronischer schussfadenwaechter an einer webmaschine mit greiferschuetzen.

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US4359068A true US4359068A (en) 1982-11-16

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US06/144,231 Expired - Lifetime US4359068A (en) 1979-05-04 1980-04-28 Electronic weft stop motion on a gripper shuttle weaving machine

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US (1) US4359068A (enrdf_load_stackoverflow)
JP (1) JPS55152840A (enrdf_load_stackoverflow)
CH (1) CH639152A5 (enrdf_load_stackoverflow)
DE (1) DE3016192A1 (enrdf_load_stackoverflow)
FR (1) FR2455646A1 (enrdf_load_stackoverflow)
GB (1) GB2051893B (enrdf_load_stackoverflow)
IT (1) IT1131114B (enrdf_load_stackoverflow)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4471817A (en) * 1981-01-07 1984-09-18 Leesona Corporation Fluid weft insertion loom monitoring system
US4872488A (en) * 1987-09-02 1989-10-10 Picanol N.V. Device for determining the position of a warp thread break
US5050648A (en) * 1988-09-08 1991-09-24 Vamatex S.P.A. System to control weft tension in a loom with continuous weft feed
US5159822A (en) * 1990-03-14 1992-11-03 H. Stoll Gmbh & Co. Threading and yarn-changing device for yarn guides
US5462094A (en) * 1991-09-23 1995-10-31 Iro Ab Sensor activated weft tension device
US6253795B1 (en) * 1998-03-14 2001-07-03 Stephan Kuster Tensioning apparatus and method for an interlaced thread
US6418977B1 (en) * 1998-12-18 2002-07-16 Iro Patent Ag Yarn processing system with weft yarn tension regulation
WO2002066721A1 (fr) * 2001-02-20 2002-08-29 Obs Inc. Dispositif de production de tissu tisse de fils a fibres expansees
US20040016472A1 (en) * 2000-10-24 2004-01-29 Stefano Lamprillo Weft thread monitoring device
US20120222536A1 (en) * 2009-11-12 2012-09-06 Bortolin Kemo S.P.A. Machine for depalletising a multi-layer load
US20190003086A1 (en) * 2015-06-18 2019-01-03 Kevin Kremeyer Directed Energy Deposition to Facilitate High Speed Applications
US10605279B2 (en) 2007-08-20 2020-03-31 Kevin Kremeyer Energy-deposition systems, equipment and methods for modifying and controlling shock waves and supersonic flow

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111350012B (zh) * 2020-04-24 2021-04-16 扬州市郭氏精密机械制造有限公司 一种片梭纱夹的加力装置和加力方法
KR102516285B1 (ko) * 2021-11-23 2023-03-30 주식회사 라지 탄소제직장치

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3833026A (en) * 1972-10-21 1974-09-03 Loepfe Ag Geb Device monitoring two traveling weft threads
US4051871A (en) * 1974-04-30 1977-10-04 Roj Electrotex S.P.A. Electronic device for controlling weft yarn insertion in looms
US4228828A (en) * 1977-11-01 1980-10-21 Gebruder Loepfe Ag Electronic thread monitoring device for gripper shuttle weaving machines

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH399354A (de) * 1962-12-07 1965-09-15 Sulzer Ag Verfahren zur Schussfadenüberwachung bei Greiferschützenwebmaschinen und Schussfadenwächter zur Durchführung des Verfahrens
CH479478A (de) * 1968-06-17 1969-10-15 Loepfe Ag Geb Verfahren und Vorrichtung zur Überwachung der Bewegung eines Textilfadens
DE2106991A1 (en) * 1971-02-15 1972-10-05 Fa. Jean Güsken, 4052 Dülken Weft monitor - for shuttleless loom using cam-operated hook to draw out a reserve yarn length
JPS5299367A (en) * 1976-02-17 1977-08-20 Kasuga Electric Co System for detecting cutting of woof

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3833026A (en) * 1972-10-21 1974-09-03 Loepfe Ag Geb Device monitoring two traveling weft threads
US4051871A (en) * 1974-04-30 1977-10-04 Roj Electrotex S.P.A. Electronic device for controlling weft yarn insertion in looms
US4228828A (en) * 1977-11-01 1980-10-21 Gebruder Loepfe Ag Electronic thread monitoring device for gripper shuttle weaving machines

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4471817A (en) * 1981-01-07 1984-09-18 Leesona Corporation Fluid weft insertion loom monitoring system
US4872488A (en) * 1987-09-02 1989-10-10 Picanol N.V. Device for determining the position of a warp thread break
US5050648A (en) * 1988-09-08 1991-09-24 Vamatex S.P.A. System to control weft tension in a loom with continuous weft feed
US5159822A (en) * 1990-03-14 1992-11-03 H. Stoll Gmbh & Co. Threading and yarn-changing device for yarn guides
US5462094A (en) * 1991-09-23 1995-10-31 Iro Ab Sensor activated weft tension device
US6253795B1 (en) * 1998-03-14 2001-07-03 Stephan Kuster Tensioning apparatus and method for an interlaced thread
US6418977B1 (en) * 1998-12-18 2002-07-16 Iro Patent Ag Yarn processing system with weft yarn tension regulation
US20040016472A1 (en) * 2000-10-24 2004-01-29 Stefano Lamprillo Weft thread monitoring device
US6896008B2 (en) * 2000-10-24 2005-05-24 Iropa Ag Weft thread monitoring device
WO2002066721A1 (fr) * 2001-02-20 2002-08-29 Obs Inc. Dispositif de production de tissu tisse de fils a fibres expansees
US10605279B2 (en) 2007-08-20 2020-03-31 Kevin Kremeyer Energy-deposition systems, equipment and methods for modifying and controlling shock waves and supersonic flow
US20120222536A1 (en) * 2009-11-12 2012-09-06 Bortolin Kemo S.P.A. Machine for depalletising a multi-layer load
US20190003086A1 (en) * 2015-06-18 2019-01-03 Kevin Kremeyer Directed Energy Deposition to Facilitate High Speed Applications
US10669653B2 (en) * 2015-06-18 2020-06-02 Kevin Kremeyer Directed energy deposition to facilitate high speed applications

Also Published As

Publication number Publication date
FR2455646A1 (fr) 1980-11-28
JPS6335741B2 (enrdf_load_stackoverflow) 1988-07-15
IT1131114B (it) 1986-06-18
JPS55152840A (en) 1980-11-28
DE3016192A1 (de) 1980-11-13
GB2051893B (en) 1983-03-23
CH639152A5 (de) 1983-10-31
GB2051893A (en) 1981-01-21
IT8021728A0 (it) 1980-05-02

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